Sienna: Interval Timer

Your Rhythm. Your Focus. Forget cold neon colors and piercing alarms. Sienna redefines the interval timer—with a warm, elegant design that invites you to stay consistent. Designed for HIIT, Tabata, or your own personal pace, whether at home or at the gym. DESIGN THAT INSPIRES. Sienna combines soothing, earthy tones with gentle audio cues and uplifting words to carry you through every round. Choose from five harmonious accent colors to make Sienna truly your own personal training space. FOUR MODES. ABSOLUTE FLEXIBILITY. No matter how you move—Sienna adapts seamlessly to your routine: • ROUNDS – Perfect for circuit training. Move through exercises one after another, structured by precise rest intervals. • SETS – The ultimate focus mode. Complete multiple sets of a single exercise before moving on to the next. • COUNTDOWN – A flexible timer that adjusts perfectly to your custom intervals. • STOPWATCH – Keep track of your own pace with ease—complete with lap and split times. CONSISTENCY OVER INTENSITY. Your workout isn't over when the timer stops. Use brief post-workout notes to reflect on what made you proud or what felt effortless today. Your statistics highlight your small victories and growing streaks. No pressure, no penalties—just pure motivation to turn individual sessions into a lasting rhythm. BUILT FOR IPHONE AND APPLE WATCH. Plan and customize your workouts effortlessly on your iPhone. Or leave it in your bag: Sienna runs completely standalone on your Apple Watch, guiding you right from your wrist while seamlessly saving your workouts to Apple Health. Sienna is free to download and use. For absolute focus, you can remove advertisements permanently with a single, one-time purchase.